Hammer mfg



Aug 1 4, E9289 1,680,47

A E. W SEEGER MOTOR CONTROLLER Filed June 1926 2 Sheets-Sheet l g/dw1$"VVENTOR. m o

w vwQiwi ATTORNEY Aug. 14, 1928. 1,680,478

E. W. SEEGER MOTOR CONTROLLER Filed June 3, 1926 2 Sheets-Sheet 2 IN VENTOR.

5mm 10$ BWW' ATTORNEY Patented 14, 1928.

- UNITED STATES 1,680,478 PATENT OFFICE.

EDWIN W. SEEGER, OF SOUTH MILWAUKEE, wISCONSIN, ASSIG-NOR TO THE CUTLER-HAMMEB MFG. 00., O1? MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

moron CONTROLLER.

Application flledlune 3,

This invent-ion relates to motor controllers, and is particularlyapplicable to systems for selectively starting a plurality of motorswhichare supplied with current from a common source.

The invention has among its objects to provide an improved controlsystem of the aforesaid character which provides for selective startingof a plurality of motors through the medium of a common starting device.Another object is to provide a control system of, the aforesaidcharacter including common control means for the motors which functionsupon starting of each motor to time interruption of starting connectionsand establishment of running connections.

Another object is to provi e a control system of the aforesaid characterincluding means for insuring against establishment of startingconnections for a plurality of motors simultaneousl Various otherobjects and advantages of the invention will hereinafter appear.

The accompanying drawings diagrammatically illustrate an embodiment ofthe invention'which will now be described, it being understood that theembodiment illustrated may be modified without departing from the spiritand scope of the appended claims. w

In the drawings Figure 1 diagrammatcally illustrates a control systemembodying the invention, and Fig. 2 is an across-the-line diagram of thecontrol circuits illustrated in Fig. 1.

Referring to Fig; 1 the same illustrates a plurality of three phaseinduction motors M M and M said motors being of the squirrel cage type,and a common supply circuit for said motors indicated by lines L and L.It willbe understood that as many motors as are desired may be connectedin the manner about to be described, but, in the present instance, ithas been regarded as suifioient for explaining the invention to showthree motors.

Each of the motors M, M and M has one terminal permanently connected toline L and each motor has a pair of double'pole electromagneticallyoperated switches S and R associated therewith for controlling the powerconnections thereof. Each of the switches S serves to establish lowvoltage starting connections for its respective motor 1926. Serial No.118,855.

from low voltage lines indicated by L and 1 L and each of the switches Rserves to conmeet its respective motor directly to lines L and L forrunning. Lines L and L are supplied withlow volta e current from thesupply circuit L L and medium of a double pole electromagnctically Lthrough the operated switch MS and transformer windlay 7 associatedtherewith and the system also includes a timing relay 8 which is commonto all of the motors. Each of the push button stations 0 includes a pushbutton element 9 normally in engagement with stationary contacts 10* anddepressible for en'- gagement with stationary contacts 10". Also eachpush button station C includes a normally closed pushbutton '11. Each ofthe relays, 7 is provided with an o crating winding 7 and three sets ofnorma ly open contacts 7", 7 and7 As hereinafter set forth the relay 7associated with each motor eifects control of the starting switch S ofits associated motor and also the running switch R therefor and the samealso acts to control the timing relay 8. Timing relay 8 is provided withan o crating winding 8 and two sets of norma ly open. contacts 8" and 8.Contacts 8" are elongated to pore -mit their cooperating movable contactmemher to slide thereon and said contacts and the contacts 8 are soarranged that during opening movement of the relay the contacts 8 aredisengaged" by their associated. contact member prior to disengagementof the contacts 8 by their associated contact member. 8 of the timingrelay act during startin of any of the motors to control the relayassociated with such motor, while contacts 8 act to control the startingswitch S associated with such motor.

hereinafter set forth, the re ay 8 is pro- Alsoi for purposes Ashereinafter set forth the contacts vided with a dashpot 8 for retardingopening movement thereof.

Also for purposes hereinafter set forth each starting swltch S isprovided with normally open auxiliary contacts 12 arranged in theenergizing circuit of the switch MS and normally closed auxiliarycontacts 13 arranged in the energizing circuit of the running switch Rassociated with its respective motor. Also, each running switch R isprovided with normally open auxiliar maintainin contacts 14- while theswitc MS is provided with normally open auxiliary maintaining contacts15 and normally closed auxiliary contacts 16 arranged between the pushbutton stations C and line L.

The function and operation of the aforedescribed controller togetherwith the circuit connections therefor will now be more fully describedin connection with Fig. 2. Assuming that the various control parts arein the position shown in Fig. -1, upon depression of the push button 9of the control station C the relay 7 associated with motor M isenergized by a circuit extending from line L through the normally closedauxiliary contacts 16 associated with switch MS, through the contacts 10of station C, to and through the operating winding 7 of said relay andthence through the sto button 11 of push button station C to line Inresponding the relay 7 associated with motor M establishes an energizingcircuit for the timing relay 8 extending from line L through thenormally closed auxiliary contacts 16 of switch MS through the 0 eratingwinding 8 of said relay and t enoe through the auxiliary contacts 7 toline L". Immediately upon response of timing relay 8, relay 7 of motor Mis maintained in closed position by a circuit extending through itscontacts 7 and the contacts 8 of said timing relay, while the startingswitch S is energized by a circuit extending from line L through saidcontacts 8 and 7 to and through the operating winding of starting switchS and thence through timing relay contacts 8 and contacts 7 to line H.Starting switch S in responding connects the outer terminalsof motor Mto lines L and L and the auxiliary contacts 12 of said starting switchestablish an energizingcircuit for switch MS extending from ine is toand through the operatin winding of switch MS to and through saiauxiliary contacts 12 and thence through contacts 7 to line L. Switch MSin respondin connects lines L and L to lines L and respectively, throughthe medium of the aforedescribed transformer windings 5 and 6,

and the motor M is thus supplied with low volta e starting current.Switch MS in respondin establishes a maintaining circuit for itselfextending from line L to and through its operating winding, and thencethrou h its auxiliary contacts 15 and contacts 7" closure of switch MSthe auxiliary contacts 16 are opened to interrupt the aforedescrlbedenergizing circuit for timing relay 8. 'Iiming relay 8 then returns tonormal osltion against the action of its associate dashpot, and asbefore stated the contacts 8 thereof are opened prior to opening of thecontacts 8". U on opening of contacts 8 the aforede:cri d energizingcircuit for starting switch S is interrupted and immediately uponopening of said starting switch S running switch R is energized by acircuit extending from line L through the operating windin of saidrunning switch through the auxiliary contacts 13 of the starting switchS to and through the contacts 7 and the auxiliary contacts 15 associatedwith switch MS and thence throu h the contacts 7 to line L In closing te running switch R maintains itself by a circuit extending from line Lto and through the operating winding of said switch through theauxiliary contacts 13 associated with starting switch Sand thence-throuh the auxiliary contacts 14 associated with said runnin switch and thenormally closed sto push button -11 of control station C to ine L. Thetiming relay then returns to normal position and upon opening of itscontacts 8 and the relay 7 and the starting switch MS are deenergized toprovide for opening thereof. The control system is then in condition toprovide for starting of the other motors selectively.

' The control parts for the motors M and M are connected in the samemanner as those associated with the motor M whereby the former motorscan be also started in the manner above described. However it should benoted that the contacts 10 of the control stations are connected inseries whereby depression of any push button 9 renders all stationstherebeyond ineffective. Furthermore, it should be noted that uponestablishment of starting connections for any motor, all of the pushbutton stations are rendered ineffective through 0 ning of the auxiliarycontact 16 associate with switch MS. T e running switch for any motorcan be opened by depressing the associated push button 11 whichinterrupts the maintaining circuit for such switch.

What I claim and desire ters'Patent is:

1. In a controller for a pluralit of electric motors having a commonsupp y circuit in combination, a. startin transformer, a switch forconnecting sai transformer to the sup 1y circuit, a plurality ofswitches associated with each motor one for establishing connections tosaid transformer for starting and the other for establishing connectionsdirectly to the supply circuit for runto secure by Letto line L. Also,immediately upon' ning, control means for said switches for.

' preventing closure of a plurality of startin tric motors having acommon supp y circuit,

in combination, means for supplying low voltage starting current andhigh voltage running current to each of the motors selectively, meansfor preventin starting of a plurality of motors simu taneously and meansassociated withthe former means for effecting interruption of the lowvoltage starting connect-ions of each motor and establishment of thehigh voltage running connections there-for after a predeterminedinterval.

3. In a controller for a. plurality of electric motors having a commonsupply circuit, in combination, a pair of electro responsive switchesassociated with each motor, one for establishing low voltage startingconnections thereto and the other for connecting the same directl to thesupply circuit for running, a push utton associated with each motor andcontrol means for said switches including a plurality of relays, each ofsaid starting switches being controlled by its associated push buttonthrough the medium of one of said relays, and another of said relaysbeing adapted during starting of any motor to effect opening of thestarting switch associated with said motor and closure of the runninswitch therefor after a predetermined interval.

4. In a controller for a plurality of electric motors havin a commonsupply circuit, in combination e ectro-responsive switches forselectively establishin low Voltage starting connections and ful voltagerunning connections for each motor and control means for said switchesincluding means for preventing starti of a plurality of motorssimultaneously an means comprising a single electroresponsive relay fortiming interfuption of starting connections and estabment of runningconnections for each of the motors.

5. In a controller for a plurality of. motors having a common supplycircuit, in combi nation, a transformer, an electroresponsive switchassociated with each motor for connecting the same to said transformerfor starting, an electroresponsive switch associated with each motor fordirectly connecting the same to the supply circuit for running, meansfor selectively controlling said starting switches and a singleelectroresponsive relay ada ted to act upon closure of the startingswitc for any motor to open such switch after a given interval and closethe running switch for such motor.

6. In a controller fora plurality of motors having a common supplycircuit, in combination, electroresponsive starting and running switchesfor each motor, a push button associated with each motor for controllingsaid switches, means for rendering all of said push buttons ineflectiveupon closure of any of said starting switches, and means associated'with said former means and adapted to act upon closure of the startingswitch associated with any motor to open such sta-rtin switch and closethe running switch for suc motor after agiven interval.

7. In a controller for a pluralit of elec tric motors having a commonsupp y circuit, in combination electroresponsive starting and runningswitches for each of the motors, a push button associated with each ofsaid motors for controlling the starting switch. associated therewith,and means for rendering all of said push buttons ineffective uponclosure of any of said, starting switches.

8. In a controller for a plurality of electric motors having acommonsupply circuit, in combination, electroresponsive starting and runningswitches for each of the motors, a push button associated with eachmotor for controlling the starting switch therefor, means for renderingall of said push buttons inefi'ective upon establishment of startingconnections for any of said motors and means including an electroresonsive relay adapted to act upon closure of t e'starting switch for anymotor,to -o n'such starting switch and close the runmng switch for suchmotor after a given interval.

In witness whereof, I have hereunto subscribed my name.

EDWIN W. SEEGER.

